weldments in assembly?

hi i'm new to the program and have upgraded from Auto CAD LT2005 so its a pretty big jump. We're a small business that designsand fabricates aluminum vacuum tanks.

What I was wondering is it possible to use a weldment in anassembly. When I get into my assembly I have my wrapped barrel withholes to put in my aluminum primary trap (which is drawn as aseparate part) for the pump that we weld to the tank.

We use a lot of aluminum parts in our product that get weldedtogether. So taking this a step farther I guess the best way to askmy question is, do I have to draw everything thats welded togetheras 1 part. Or is there a way to add a weldment while assemblingeverything.

Thanks,
ZachSolidworksAssemblies